scholarly journals The scalar triplet contribution to lepton flavour violation and neutrinoless double beta decay in Left-Right Symmetric Model

2016 ◽  
Vol 2016 (4) ◽  
pp. 1-28 ◽  
Author(s):  
Gulab Bambhaniya ◽  
P. S. Bhupal Dev ◽  
Srubabati Goswami ◽  
Manimala Mitra
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Symmetric Model ◽  
Lepton Flavour Violation ◽  
Flavour Violation ◽  
Lepton Flavour

scholarly journals Lepton flavour violation in a left-right symmetric model

1999 ◽  
Vol 1999 (05) ◽  
pp. 012-012
Author(s):  
Sergio Pastor ◽  
Saurabh D Rindani ◽  
José W. F Valle
Keyword(s):  
Symmetric Model ◽  
Lepton Flavour Violation ◽  
Flavour Violation ◽  
Lepton Flavour

scholarly journals Probing leptogenesis

2018 ◽  
Vol 33 (05n06) ◽  
pp. 1842005 ◽  
Author(s):  
E. J. Chun ◽  
G. Cvetič ◽  
P. S. B. Dev ◽  
M. Drewes ◽  
C. S. Fong ◽  
...  
Keyword(s):  
Beta Decay ◽  
Neutrino Oscillation ◽  
Necessary Conditions ◽  
Experimental Tests ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Symmetric Model ◽  
High Scale ◽  
Heavy Leptons ◽  
Neutral Heavy Leptons

The focus of this paper lies on the possible experimental tests of leptogenesis scenarios. We consider both leptogenesis generated from oscillations, as well as leptogenesis from out-of-equilibrium decays. As the Akhmedov–Rubakov–Smirnov (ARS) mechanism allows for heavy neutrinos in the GeV range, this opens up a plethora of possible experimental tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches for neutral heavy leptons at future facilities. In contrast, testing leptogenesis from out-of-equilibrium decays is a quite difficult task. We comment on the necessary conditions for having successful leptogenesis at the TeV-scale. We further discuss possible realizations and their model specific testability in extended seesaw models, models with extended gauge sectors, and supersymmetric leptogenesis. Not being able to test high-scale leptogenesis directly, we present a way to falsify such scenarios by focusing on their washout processes. This is discussed specifically for the left–right symmetric model and the observation of a heavy [Formula: see text], as well as model independently when measuring [Formula: see text] washout processes at the LHC or neutrinoless double beta decay.

scholarly journals Neutrinoless double beta decay in minimal left–right symmetric model with universal seesaw

2018 ◽  
Vol 33 (35) ◽  
pp. 1850198 ◽  
Author(s):  
Debasish Borah ◽  
Arnab Dasgupta ◽  
Sudhanwa Patra
Keyword(s):  
Beta Decay ◽  
Parameter Space ◽  
Half Life ◽  
Mass Matrix ◽  
Neutrinoless Double Beta Decay ◽  
New Physics ◽  
Double Beta Decay ◽  
Model Parameters ◽  
Symmetric Model ◽  
Neutrino Mixing

We present a detailed discussion on neutrinoless double beta decay [Formula: see text] within left–right symmetric models based on the gauge symmetry of type [Formula: see text] as well as [Formula: see text] where fermion masses including that of neutrinos are generated through a universal seesaw mechanism. We find that one or more of the right-handed neutrinos could be as light as a few keV if left–right symmetry breaking occurs in the range of a few TeV to 100 TeV. With such light right-handed neutrinos, we perform a detailed study of new physics contributions to [Formula: see text] and constrain the model parameters from the latest experimental bound on such a rare decay process. We find that the new physics contribution to [Formula: see text] in such a scenario, particularly the heavy–light neutrino mixing diagrams, can individually saturate the existing experimental bounds, but their contributions to total [Formula: see text] half-life cancel each other due to unitarity of the total [Formula: see text] mass matrix. The effective contribution to half-life therefore, arises from the purely left and purely right neutrino and gauge boson mediated diagrams. We find that the parameter space saturating the [Formula: see text] bounds remains allowed from the latest experimental bounds on charged lepton flavor violating decays like [Formula: see text]. We finally include the bounds from cosmology and supernova to constrain the parameter space of the model.

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